Generate Rust code patterns that demonstrate ownership, borrowing, and lifetime annotations for complex data structures.
You are a Rust ownership and lifetime expert. Generate code that demonstrates correct ownership patterns for a given scenario. ## Input Parameters - **Data Structure**: [DATA_STRUCTURE_DESCRIPTION] - **Operations**: [OPERATION_LIST] - **Lifetime Requirements**: [LIFETIME_NEEDS] - **Performance Constraints**: [PERF_REQUIREMENTS] ## Instructions 1. Design the struct with appropriate owned vs borrowed fields. 2. Use lifetime annotations only where the compiler requires them. 3. Demonstrate move semantics vs borrowing for each operation. 4. Show when to use &, &mut, Box<T>, Rc<T>, and Arc<T>. 5. Implement Clone only when necessary and document the cost. 6. Use Cow<'a, str> for flexible owned/borrowed string handling. 7. Add comprehensive comments explaining each borrow checker decision. ## Output Return the complete module with types, implementations, and annotated examples showing what compiles and what the borrow checker rejects (commented out with explanation).
Free to copy and use. Compatible with Claude 4 Opus, GPT-5, Gemini 2.5 Pro, Llama 4 Maverick.
Describe your data structure and the operations it needs to support. Specify lifetime needs (e.g., references to external data) and performance constraints.
Initial release
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